<template>
    <div>
         <!-- 面包屑导航 -->
        <el-breadcrumb separator="/">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>分类参数</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图区 -->
        <el-card>
            <!-- 警告区域 -->
            <el-alert title="注意:只允许为第三级分类设置相关参数！" type="warning" :closable="false" show-icon>
            </el-alert>
            <!-- 选择商品分类区域 -->
            <el-row class='cat_opt'>
                <el-col>
                    <span>选择商品分类：</span>
                    <!-- 选择商品分类的级联选择框 -->
                    <el-cascader v-model="selectedCateKeys" :options="cateList" :props="cateProps" @change="handleChange"></el-cascader>
                </el-col>
            </el-row>
            <!-- tab 页签区域 -->
            <el-tabs v-model="activeName" @tab-click="handleClick">
                <!-- 添加动态参数的面板 -->
                <el-tab-pane label="动态参数" name="many">
                    <el-button type='primary' size="mini" :disabled='isBtnDisabled' @click='addDialogVisible=true'>添加参数</el-button>
                    <!-- 动态参数表格 -->
                    <el-table :data='manyTableData' border stripe>
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染tag标签 -->
                                <el-tag v-for='(item,i) in scope.row.attr_vals' :key='i' closable @close='handleClosed(i,scope.row)'>{{item}}</el-tag>
                                <!--  输入的文本框-->
                                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)"
                                ></el-input>
                                <!-- 添加按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index" label="#"></el-table-column>
                        <el-table-column label="参数名称" prop='attr_name'></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button type="primary" icon="el-icon-edit" size='mini' @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button type="danger" icon="el-icon-delete" size='mini' @click='removeParams(scope.row.attr_id)'>删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                <!-- 添加静态属性的面板 -->
                <el-tab-pane label="静态属性" name="only">
                    <el-button type='primary' size="mini" :disabled='isBtnDisabled' @click='addDialogVisible=true'>添加属性</el-button>
                    <!-- 静态属性表格 -->
                    <el-table :data='onlyTableData' border stripe>
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染tag标签 -->
                                <el-tag v-for='(item,i) in scope.row.attr_vals' :key='i' closable @close='handleClosed(i,scope.row)'>{{item}}</el-tag>
                                <!--  输入的文本框-->
                                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)"
                                ></el-input>
                                <!-- 添加按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index" label="#"></el-table-column>
                        <el-table-column label="属性名称" prop='attr_name'></el-table-column>
                        <el-table-column label="操作" width="130px">
                            <template slot-scope="scope">
                                <el-button type="primary" icon="el-icon-edit" size='mini' @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button type="danger" icon="el-icon-delete" size='mini' @click='removeParams(scope.row.attr_id)'>删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>
        </el-card>
        <!-- 添加动态参数/静态属性的对话框 -->
        <el-dialog :title="'添加'+titleText" :visible.sync="addDialogVisible" width="50%" @close='addDialogClosed'>
            <!-- 添加参数的form表单 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="addForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="addDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="addParams">确 定</el-button>
        </span>
        </el-dialog>
        <!-- 修改动态参数/静态属性的对话框 -->
        <el-dialog :title="'修改'+titleText" :visible.sync="editDialogVisible" width="50%" @close='editDialogClosed'>
            <!-- 修改参数的form表单 -->
            <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="editForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="editDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="editParams">确 定</el-button>
        </span>
        </el-dialog>
    </div>
</template>
<script>
export default {
    data(){
        return{
            // 商品分类列表
            cateList:[],
            // 级联选择框的配置对象
            cateProps:{ 
                expandTrigger: 'hover',
                label:'cat_name',
                value:'cat_id',
                children:'children'
            },
            // 级联选择框双向绑定到的数组
            selectedCateKeys:[],
            // 被激活的页签名称
            activeName:'many',
            // 动态参数的数据
            manyTableData:[],
            // 静态参数的数据
            onlyTableData:[],
            // 控制添加对话框的显示与隐藏
            addDialogVisible:false,
            // 添加参数表单的数据对象
            addForm:{
                attr_name:''
            },
            // 添加参数表单数据对象的验证规则
            addFormRules:{
                attr_name:[
                    {required:true,message:'请输入参数名称',trigger:'blur'}
                ]
            },
            // 控制修改对话框的显示与隐藏
            editDialogVisible:false,
            // 修改参数表单的数据对象
            editForm:{
                attr_name:''
            },
            // 修改参数表单数据对象的验证规则
            editFormRules:{
                attr_name:[
                    {required:true,message:'请输入参数名称',trigger:'blur'}
                ]
            },
            // // 控制文本框与按钮的切换显示
            // inputVisible:false,
            // // 文本框输入的内容
            // inputValue:''
        }
    },
    created(){
        this.getCateList()
    },
    methods:{
        // 获取所有的商品分类列表
        async getCateList(){
            const {data:res} = await this.$http.get('categories')
            if(res.meta.status!==200)return this.$message.error('获取商品分类列表失败')
            this.cateList=res.data
            // console.log(this.cateList)
        },
        // 级联选择框选中项变化，会触发这个函数
        async handleChange(){
            this.getParamsData()
        },
        // 获取参数列表
       async getParamsData(){
           // 证明选中的不是三级分类
            if(this.selectedCateKeys.length!==3){
                this.selectedCateKeys=[]
                this.manyTableData=[]
                this.onlyTableData=[]
                return
            }
            // 证明选中的是三级分类
            // console.log(this.selectedCateKeys)
            // 根据所选分类的id，和当前所处的面板，获取对应的参数
           const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:this.activeName}})
           if(res.meta.status!==200)return this.$message.error('获取参数列表失败！')
            res.data.forEach(item=>{
                item.attr_vals= item.attr_vals ?item.attr_vals.split(','):[]
                // 控制文本输入框的显示与隐藏
                item.inputVisible=false
                // 文本输入框的内容
                item.inputValue=''
            })
               console.log(res.data)
           if(this.activeName==="many"){
               this.manyTableData=res.data
           }else{
               this.onlyTableData=res.data
           }
        },
        // tab页签点击事件的处理函数
        handleClick(){
            // console.log(this.activeName)
            this.getParamsData()
        },
        // 监听添加对话框的关闭
        addDialogClosed(){
            this.$refs.addFormRef.resetFields()
        },
        // 点击按钮，添加参数
        addParams(){
            this.$refs.addFormRef.validate(async valid=>{
                if(!valid)return
                const {data:res} = await this.$http.post(`categories/${this.cateId}/attributes`,{
                    attr_name:this.addForm.attr_name,
                    attr_sel:this.activeName
                })
                if(res.meta.status!==201)return this.$message.error('添加参数失败！')
                this.$message.success('添加参数成功')
                this.getParamsData()
                this.addDialogVisible=false
            })
        },
        // 点击按钮，展示修改的对话框
        async showEditDialog(attrId){
            // 查询当前参数的信息
            // console.log(attrId)
            const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes/`+attrId,{params:{attr_sel:this.activeName}})
            if(res.meta.status!==200) return this.$message.error(res.meta.msg)
            this.editForm=res.data
            this.editDialogVisible=true
        },
        // 重置修改的表单
        editDialogClosed(){
            this.$refs.editFormRef.resetFields()
        },
        // 点击按钮，修改参数信息
        editParams(){
             this.$refs.editFormRef.validate(async valid=>{
            if(!valid)return
            const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
                attr_name:this.editForm.attr_name,
                attr_sel:this.activeName
            })
            if(res.meta.status!==200)return this.$message.error('修改参数失败！')
            this.$message.success('修改参数成功！')
            this.getParamsData()
            this.editDialogVisible=false
            })
        },
        // 根据id删除参数
        removeParams(attr_id){
             this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
                }).then(async () => {
                    const {data:res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
                    if(res.meta.status!==200)return this.$message.error('删除参数失败！')
                    this.getParamsData()
                this.$message({
                    type: 'success',
                    message: '删除参数成功!'
                });
                }).catch(() => {
                this.$message({
                    type: 'info',
                    message: '已取消删除'
                });          
            });
        },
        // 文本框失去焦点或按下了回车键都会触发
        async handleInputConfirm(row){
            // console.log('ok')
            if(row.inputValue.trim().length ===0){
                row.inputValue=""
                row.inputVisible=false
                return
            }
            // 如果没有return，则证明输入的内容，需要做后续处理
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue=""
            row.inputVisible=false
            // 需要发起请求，保存这次操作
            this.saveAttrVals(row)
        },
        // 点击按钮，展示文本输入框
        showInput(row){
            row.inputVisible=true
            // 让文本框自动获得焦点
            // $nextTick方法的作用：当页面上元素被重新渲染之后，才会指定回调函数中的代码
            this.$nextTick(_ => {
            this.$refs.saveTagInput.$refs.input.focus();
            });
        },
        // 将对attr_vals的操作保存到数据库
        async saveAttrVals(row){
            const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/`+row.attr_id,{
                attr_name:row.attr_name,
                attr_sel:row.attr_sel,
                attr_vals:row.attr_vals.join(',')
            })
            if(res.meta.status!==200)return this.$message.error('修改参数项失败！')
            this.$message.success("修改参数项成功！")
        },
        // 删除对应的参数可选项
        handleClosed(i,row){
            row.attr_vals.splice(i,1)
            this.saveAttrVals(row)

        }
    },
    computed:{
        // 如果按钮需要被禁用，则返回true，否则返回false
        isBtnDisabled(){
            return this.selectedCateKeys.length !== 3
        },
        // 当前选中三级分类的id
        cateId(){
           if(this.selectedCateKeys.length===3)return this.selectedCateKeys[2]
           return null
        },
        // 动态计算标题的文本
        titleText(){
            if(this.activeName==='many')return '动态参数'
            return '静态属性'
        }
    }
}
</script>
<style lang="less" scoped>
    .cat_opt{
        margin: 15px 0;
    }
    .el-tag{
        margin: 10px;
    }
    .input-new-tag{
        width: 150px;
    }
</style>